{"id":110711,"date":"2023-10-10T03:10:26","date_gmt":"2023-10-10T01:10:26","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/ubuntu-ogranichit-dostup-k-user-namespace"},"modified":"2023-10-10T03:10:26","modified_gmt":"2023-10-10T01:10:26","slug":"ubuntu-ogranichit-dostup-k-user-namespace","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/ubuntu-ogranichit-dostup-k-user-namespace","title":{"rendered":"Ubuntu obmedz\u00ed pr\u00edstup k user namespace","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Spolo\u010dnos\u0165 Canonical ozn\u00e1mila zmeny v Ubuntu 23.10, ktor\u00e9 obmedzuj\u00fa pr\u00edstup pou\u017e\u00edvate\u013eov k priestorom mien identifik\u00e1torov pou\u017e\u00edvate\u013eov (user namespace), \u010d\u00edm sa zv\u00fd\u0161i bezpe\u010dnos\u0165 syst\u00e9mov vyu\u017e\u00edvaj\u00facich kontajnerov\u00fa izol\u00e1ciu pred zranite\u013enos\u0165ami, ktor\u00e9 vy\u017eaduj\u00fa manipul\u00e1ciu s user namespace. Pod\u013ea \u00fadajov Google 44% exploitov zapojen\u00fdch do programu na vypl\u00e1canie odmien za odha\u013eovanie zranite\u013enost\u00ed v jadre Linuxu vy\u017eaduje mo\u017enos\u0165 vytv\u00e1rania priestorov mien identifik\u00e1torov pou\u017e\u00edvate\u013eov. <\/p>\n

Namiesto \u00faplnej blok\u00e1cie pr\u00edstupu k user namespace v Ubuntu bola pou\u017eit\u00e1 hybridn\u00e1 sch\u00e9ma, ktor\u00e1 selekt\u00edvne umo\u017e\u0148uje niektor\u00fdm programom vytv\u00e1ra\u0165 user namespace pri existencii profilu AppArmor s pravidlom \u201eallow userns create\u201c alebo pr\u00e1vom CAP_SYS_ADMIN. Napr\u00edklad pre Chrome bol vytvoren\u00fd profil \/etc\/apparmor.d\/opt.google.chrome.chrome, ktor\u00fd m\u00f4\u017ee sl\u00fa\u017ei\u0165 ako pr\u00edklad na otvorenie pr\u00edstupu k user namespace pre in\u00e9 programy. <\/p>\n

V nadch\u00e1dzaj\u00facom vydan\u00ed Ubuntu 23.10 sa pl\u00e1nuje obmedzenie pr\u00edstupu k user namespace pon\u00faknu\u0165 ako mo\u017enos\u0165, ktor\u00e1 nie je predvolene povolen\u00e1. V priebehu nieko\u013ek\u00fdch t\u00fd\u017ed\u0148ov po vydan\u00ed Ubuntu 23.10 v\u00fdvoj\u00e1ri zhroma\u017edia inform\u00e1cie o mo\u017enom negat\u00edvnom vplyve deaktiv\u00e1cie pr\u00edstupu k user namespace na fungovanie bal\u00edkov a pripravia pr\u00edslu\u0161n\u00e9 profily AppArmor. N\u00e1sledne bude toto obmedzenie v r\u00e1mci jedn\u00e9ho z oprav\u00e1rensk\u00fdch aktualiz\u00e1ci\u00ed bal\u00edka s jadrom (Stable Release Updates) aktivovan\u00e9 ako predvolen\u00e9. <\/p>\n

Na pred\u010dasn\u00e9 aktivovanie obmedzenia m\u00f4\u017eete pou\u017ei\u0165 nasleduj\u00face pr\u00edkazy: sudo sysctl -w kernel.apparmor_restrict_unprivileged_unconfined=1 sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=1 <\/p>\n

A na jeho deaktivovanie: sudo sysctl -w kernel.apparmor_restrict_unprivileged_unconfined=0 sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Canonical \u043e\u0431\u044a\u044f\u0432\u0438\u043b\u0430 \u043e \u0432\u043d\u0435\u0441\u0435\u043d\u0438\u0438 \u0432 Ubuntu 23.10 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439, \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0432\u0430\u044e\u0449\u0438\u0445 \u0434\u043e\u0441\u0442\u0443\u043f \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u043a \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0430\u043c \u0438\u043c\u0451\u043d \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f (user namespace), \u0447\u0442\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442 \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u043e\u0441\u0442\u044c \u0441\u0438\u0441\u0442\u0435\u043c, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0445 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u043d\u0443\u044e \u0438\u0437\u043e\u043b\u044f\u0446\u0438\u044e, \u043e\u0442 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0434\u043b\u044f \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u044b \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438 \u0441 user namespace. \u041f\u043e \u0434\u0430\u043d\u043d\u044b\u043c Google, 44% \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u043e\u0432, \u0443\u0447\u0430\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0445 \u0432 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0435 \u043f\u043e \u0432\u044b\u043f\u043b\u0430\u0442\u0435 \u0434\u0435\u043d\u0435\u0436\u043d\u044b\u0445 \u0432\u043e\u0437\u043d\u0430\u0433\u0440\u0430\u0436\u0434\u0435\u043d\u0438\u0439 \u0437\u0430 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u044f\u0434\u0440\u0435 Linux, […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-110711","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Ubuntu obmedz\u00ed pr\u00edstup k user namespace | ProHoster","description":"Spolo\u010dnos\u0165 Canonical ozn\u00e1mila zmeny v Ubuntu 23.10, ktor\u00e9 obmedzuj\u00fa pr\u00edstup pou\u017e\u00edvate\u013eov k priestorom mien identifik\u00e1torov pou\u017e\u00edvate\u013eov (user namespace), \u010d\u00edm sa zv\u00fd\u0161i bezpe\u010dnos\u0165 syst\u00e9mov.","canonical_url":"https:\/\/prohoster.info\/sk\/blog\/news\/ubuntu-ogranichit-dostup-k-user-namespace","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sk_SK","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47Ubuntu \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0442 \u0434\u043e\u0441\u0442\u0443\u043f \u043a user namespace | ProHoster","og:description":"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Canonical \u043e\u0431\u044a\u044f\u0432\u0438\u043b\u0430 \u043e \u0432\u043d\u0435\u0441\u0435\u043d\u0438\u0438 \u0432 Ubuntu 23.10 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439, \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0432\u0430\u044e\u0449\u0438\u0445 \u0434\u043e\u0441\u0442\u0443\u043f \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u043a \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0430\u043c \u0438\u043c\u0451\u043d \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f (user namespace), \u0447\u0442\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442 \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u043e\u0441\u0442\u044c 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